https://accounts.google.com/b/0/EditUserInfo, where IAM the admin and see no settings on my google apps dashboard other than Organization & Users > services > Google Voice (ENABLED). I have even tried toggling it off and back on.

You can't change your Google Voice account number or associate it with a different Gmail account. Your Google Voice account number should match your Gmail account number otherwise you will not be able to use Google Chat as a forwarding phone.

See this about transferring your Google Voice number to a different GV account: